Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2004-04-05
2008-03-18
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090160, C123S090170, C123S090310, C701S102000, C701S105000, C701S107000, C464S001000, C464S002000, C464S160000, C092S121000, C092S122000
Reexamination Certificate
active
07343887
ABSTRACT:
An abnormality diagnosis system100includes a VVT controller110, an adjustable valve mechanism120, a cam angle sensor130, a model computation module140, an abnormality detection module150, and an alarm lamp160. The adjusable valve mechanism120advances or delays a phase angle of an intake cam shaft relative to a crankshaft, thereby varying an open-close timing of a valve. The model computation module140computes a physical behavior of the adjustable valve mechanism120according to a physical model, in response to a control signal input from the VVT controller110. The abnormality detection module150determines whether the adjustable valve mechanism120is abnormal or normal, based on a difference between a theoretical value of phase angle calculated according to the physical model and an observed value of phase angle measured with the cam angle sensor130. The arrangement of the invention ensures highly accurate abnormality diagnosis of the adjustable valve mechanism120.
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Denion Thomas
Oliff & Berridg,e PLC
Riddle Kyle M.
Toyota Jidosha & Kabushiki Kaisha
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